One who, or that which, filters. Henfrey. [1913 Webster]
A type of coffee pot in which the heated water is driven by its boiling action up above a porous canister of coffee held above the level of the water in the pot, and then filters (percolates) back through the coffee thus extracting its essence. [Webster 1913 Suppl.]
An apparatus for producing an extract from a drug by percolation. [Webster 1913 Suppl.]